JPS6236546Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot melt adhesive coating device for bottom paper for closing the opening of a filled bag.

As shown in Figure 1a, the alternating folded bottom of the bag for powder filling is made by flattening a cylindrical base paper, cutting it into a predetermined length, opening the openings at both ends, and folding both corners 1 and 2 inward in a triangular shape. As shown in the figure, upper tongue pieces 3 and lower tongue pieces 4 are formed, and these upper tongue pieces 3 and lower tongue pieces 4 are further alternately folded inward at intermediate height positions and folded back. The tongue pieces 5 and 6 are formed and these folded tongue pieces 5 and 6 are pasted with dot glue, etc., and a portion of the hot melt adhesive 7 and other permanent fixing adhesive 8 are applied to the upper surface of the base plate. A paper 9 (FIG. 2b) is attached and fixed to the upper surface of the above-mentioned folded tongue pieces 5 and 6 with adhesive 8, leaving the hot melt adhesive 7, and this folded bottom and The bottom on the opposite side is completely closed, and a powder material supply nozzle (not shown) is inserted into the bag from the part of the bag where the hot melt adhesive 7 is not attached. After filling the powder material, the hot-melt adhesive 7 of the adhesive paper 9 is applied by heating and melting, and is then cooled and hardened to seal it.

Conventionally, it is difficult to uniformly apply the hot melt adhesive 7 on the adhesive paper 7 as described above, and because the surface is uneven, the powdery material remains and adheres to the hot melt adhesive 7 application area, resulting in complete sealing. However, it was not possible to do so, and the strength of the sealed portion was insufficient, among other drawbacks.

The object of the present invention is to eliminate the above-mentioned conventional drawbacks and to provide a hot melt adhesive application device for base paper for closing the opening of a filling bag, which makes the hot melt adhesive application area of the base paper uniform and smooth. do.

The hot melt adhesive applicator according to the present invention is partially immersed in the hot melt adhesive held in a heated molten state in an adhesive container, and is used to hold a predetermined length of adhesive in the circumferential direction on a part of the circumferential surface. a rotary glue roll having a recess and for applying a hot melt adhesive held in the recess to a strip-shaped base paper base paper guided along a circumferential surface; and a rotating glue roll disposed in contact with the circumferential surface of the glue roll. , a doctor blade for removing the hot melt adhesive adhering to the circumferential surface other than the recess, and a doctor blade for removing the hot melt adhesive from the glue roll for a predetermined period of time in synchronization with the part of the base paper coated with the hot melt adhesive being sent out from the glue roll. a hot roll that is movably arranged from a remote position to a position close to the glue roll and that guides base paper coated with a hot melt adhesive to prevent the coated hot melt adhesive from cooling and hardening; A hot melt adhesive that is placed between the glue roll and close to the side from which the base paper is sent out, and that is applied to the base paper in contact with the base paper that is guided along the circumference of the hot roll that approaches the glue roll in synchronization. a cooling roll that guides the base paper so as to cool and harden the hot melt adhesive applied to the base paper; a cooling roll that is movable toward and away from the heat roll in synchronization with the heat roll that presses and homogenizes the adhesive; and the heat roll The present invention is characterized by comprising: an actuating device that applies the synchronized motion to the cooling roll; and a cutter roll that cuts the base paper fed from the cooling roll at a predetermined position.

With this configuration, according to the hot melt adhesive applicator of the present invention, when the hot melt adhesive applied to the base paper is guided around the hot roll, the hot roll approaches the thermal heater in synchronization with the hot melt adhesive applied to the base paper. The hot melt adhesive is applied to the base paper with a uniform thickness, and when the hot melt adhesive reaches the end of the coated area, the hot roll is synchronously separated from the thermal heater and melted onto the base paper. This has the effect of cutting the threads of the hot melt adhesive to maintain the correct boundaries of the applied area.

Preferred embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, the belt-shaped base paper 11 that is rolled up from the belt-shaped base paper base paper roll 10 is guided by a guide roll 12,
13 to a rotating glue roll 14. The rotating glue roll 14 has a length in the circumferential direction corresponding to the coating width of the hot melt adhesive 7 on the base paper 9, and forms a shallow groove 14a for receiving and holding just the right amount of the hot melt adhesive 7. and the lower one
part is held in the adhesive container 15 and the heater 16
The glue roll 14 is immersed in hot melt adhesive 7 heated to an appropriate molten state, and as the glue roll 14 rotates, the hot melt adhesive 7 is deposited on the circumferential surface of the glue roll 14.

A doctor blade 17 is provided that contacts the circumferential surface of the glue roll 14 on the side to which the hot melt adhesive 7 is applied, and scrapes off the adhesive 7 on the circumferential surface other than the adhesive 7 accumulated in the groove 14a. It is designed to be removed.

A hollow hot roll 18 is placed above and close to the glue roll 14, and a sweater 19 is placed inside this hot roll 18 to keep the hot melt adhesive 7 on the surface of the hot roll 18 in an appropriate melted state. It is designed to heat up to a certain temperature. The heating roll 18 and the hollow cooling roll 21, which is disposed close to the top of the roll, houses a cooling bar 20 therein, and is cooled to a temperature at which the hot melt adhesive 7 is cooled and hardened are connected to the axis of these rolls. are rotatably supported by a pair of heat roll support members 22, 22' and a pair of cooling roll support members 23, 23', respectively, which support the support members 22, 22' and 23, 23', respectively. The support members 22, 22' and the support above the guide members 24, 24', 25, 25' are arranged to be movable in the vertical direction as shown in FIG. The members 23 and 23' are connected by a connecting member or a spring, respectively, and the supporting member 2
Actuating devices 26, 26', such as air cylinders, disposed above the supporting members 23, 23', respectively, are connected to the supporting members 23, 23'.
6' causes the heating rolls 22, 22' and the cooling rolls 23, 23' to move vertically synchronously with each other, and this synchronous vertical movement is guided to the glue roll 14 as will be described later. After the hot melt adhesive 7 is applied to the base paper 11 that has been prepared by the glue roll 14, the portion of the base paper 11 coated with the hot melt adhesive 7 is sent out from the gap between the glue roll 14 and the hot roll 18 to be described later. At the same time, the hot roll 18 approaches the glue roll 14, and the cooling roll 21 approaches the hot roll 1.
8, the hot melt adhesive 7 on the base paper 11
When the end of the applied portion reaches the aforementioned predetermined position, the heat roll 18 is synchronously moved away from the glue roll 14 and the cooling roll 21 is moved away from the heat roll 18. There is.

According to the feature of the present invention, a cylindrical thermal heater 27 is arranged in the gap between the glue roll 14 and the heat roll 18 at a position close to the side from which the base paper 11 is sent out. The position of the thermal heater 27 is determined by the actuating devices 26, 26' when the portion of the base paper 11 fed from the glue roll 14 coated with the hot melt adhesive 7 reaches the predetermined position described above, which just reaches the position of the thermal heater 27. Heat roll 18 synchronously
moves toward the glue roll 14 and approaches the thermal heater 27, whereby the tip of the portion of the base paper 11 that is guided on the thermal roll 18 and coated with the hot-melt adhesive 7 reaches the thermal heater 27. 27, and the rotation of the hot roll 18 ensures that the hot melt adhesive 7 is smoothly stretched and adhered to the base paper 11 with a uniform thickness;
When the end of the applied part of the hot melt adhesive 7 has just reached the position of the thermal heater 27, the actuating device 2
6, 26', as shown in FIG.
The thermal heater 27 is moved away from the end of the coated part of the hot melt adhesive 7 of the base paper 11 on the hot roll 18, and at that time, the molten hot melt adhesive may drip from the coated part. 7 is received by the thermal heater 27 and the base paper 11 is
The thread-cutting action of the hot melt adhesive 7 from the base paper 11 is carried out reliably to maintain accurate boundaries of the area to which the hot melt adhesive 7 is applied on the base paper 11.

The base paper 11 sent out from the cooling roll 21 is transferred to first delivery/cooling rolls 28 and 28' each having cooling bars 28a and 28'a, a dancer roll 29, a guide roll 30, and a second delivery roll 3.
1, 31' and is fed at a predetermined speed to the cutting blade 32.
The base paper 11 is cut by being passed between a cutter roll 32 having a blade 32a and a correspondingly disposed receiving roll 33 having a receiving blade 33a. The cutting action is timed to cut precisely along the leading edge of the part. FIG. 5 shows a cutting position a at which the front edge of the portion of the base paper 11 coated with the hot melt adhesive 7 is cut.

The operation of the hot melt adhesive coating apparatus according to the present invention constructed as described above can be clearly understood from the above explanation, and will be briefly explained as follows.

The base paper 11 unrolled from the strip-shaped base paper base paper roll 10 is guided to the upper surface of the glue roll 14 via guide rolls 12 and 13. As the glue roll 14 rotates, the molten hot melt adhesive 7 in the container 15 is adhered to the circumference of the glue roll 14 and to the recess 14a, and the hot melt adhesive 7 except for the hot melt adhesive 7 held in the recess 14a by the doctor blade 17 is completely removed. Only the adhesive 7 in the recess 14a is transferred and applied onto the base paper 11 and guided on the hot roll 18, but the tip edge of the applied part of the hot melt adhesive 7 on the base paper 11 is just heated. When the position of the heater 27 is reached, the actuating devices 26 and 26' actuate the heat roll 18 together with the cooling roll 21 to move closer to the glue roll 14 and the heat heater 27, so that the heat heater 27 adheres the hot melt on the base paper 11. Agent 7
The hot melt adhesive 7 on the base paper 11 is smoothly stretched to a uniform thickness by the thermal heater 27 due to the rotation of the heat roll 18 and the feeding motion of the base paper 11 on the heat roll 18. When the end of the applied portion reaches the position of the thermal heater 27, the thermal roll 18 is separated from the thermal heater 27 by actuation of the actuating devices 26, 26', and the excess portion of the hot melt adhesive 7 is transferred to the thermal heater 27. This ensures that the thread cutting action is performed so that the hot melt adhesive 7 on the base paper 11 does not flow and sag.

After that, the base paper 11 is guided on the cooling roll 21 to cool and harden the hot melt adhesive 7, and the first
Delivery rolls 28, 28', dancer roll 2
9. After passing through the second delivery rolls 31 and 31', the paper is passed between the cutter roll 32 and the receiving roll 33 and cut along the cutting line a as shown in FIG. 5 to complete the individual strength paper 9. be.

Note that another adhesive 8 can be appropriately applied to the adhesive paper 9 before being attached to the bag opening.

As described above, according to the present invention, it is possible to automatically produce paper with excellent performance at low cost.

[Brief explanation of the drawing]

FIG. 1a is a partial plan view showing the state of the bag opening to which the bottom paper according to the present invention is attached. FIG. 1b is a plan view showing a state in which adhesive is applied to the adhesive paper. FIG. 2 is a schematic side view of a hot melt adhesive coating device according to the present invention. FIG. 3 is a side view showing the arrangement of the glue roll, heat roll, cooling roll, and heat heater in FIG. 2;
FIG. 4 is a side view showing the glue roll, heat roll, cooling roll, and heat heater spaced apart from each other. FIG. 5 is a plan view showing a cutting line of a strip-shaped base paper coated with a hot melt adhesive. 7...Hot melt adhesive, 9...Resistance paper, 1
0...Band-shaped base paper roll, 11...Base paper, 1
4... Glue roll, 15... Adhesive container, 18...
Heat roll, 21...Cooling roll, 22, 22'...
...Heat roll support member, 23, 23'...Cooling roll support member, 24, 24'25, 25'...Guide member, 26, 26'...Actuation device, 28, 28'...
...First delivery and cooling roll, 29...Dancer roll, 31, 31'...Second delivery roll,
32...Cutter roll, 33...Uke roll.

Claims (1)

[Scope of utility model registration request] A part of the adhesive is immersed in a hot melt adhesive held in a heated molten state in an adhesive container, and a part of the circumferential surface has an adhesive holding recess of a predetermined length in the circumferential direction. a rotary glue roll for applying the hot melt adhesive held in the recess to the strip-shaped base paper guided along the base paper; A doctor blade for removing adhered hot melt adhesive and a part of the base paper coated with hot melt adhesive approached the glue roll from a position separated from the glue roll for a predetermined period of time in synchronization with the part of the base paper coated with the hot melt adhesive being sent out from the glue roll. A heating roll is movably disposed in a position and guides the base paper coated with hot melt adhesive to prevent the coated hot melt adhesive from cooling and hardening; a thermal heater that is arranged close to the feeding side and presses and homogenizes the hot melt adhesive applied to the base paper by contacting the base paper guided on the circumference of the heat roll that approaches the glue roll in synchronization; a cooling roll that is movable toward and away from the heating roll in synchronization with the heating roll and guiding the base paper so as to cool and harden the hot melt adhesive applied to the base paper; An apparatus for applying hot melt adhesive to bottom paper for closing the opening of a filled bag, comprising an actuating device that provides synchronized motion, and a cutter roll that cuts the base paper fed from the cooling roll at a predetermined position.